Because it belonged to World Serpent, because it belonged to World Serpent... it possessed technology from the Previous Era. After all, World Serpent's leader was none other than Ancestor Kevin.
This Fusion Warrior of Flame Moth, the anti-Honkai organization under the United Nations of the Previous Era, was also a survivor of the Final War, humanity's most powerful protector, and the original wielder of the Seventh Divine Key, Feather of Ruin. In the Current Era, he was the ancestor of the Kaslana family, a hero who bore the last hope of the Previous Era, and World Serpent's true leader.
His existence naturally allowed Mikoyan's capabilities to rival, or even surpass, Schicksal's.
"It can unleash power comparable to a small nuclear explosion..."
Little Himeko looked at the greatsword before her and was startled. A sword like this... could actually unleash such terrifying power. It was completely beyond anything she could imagine.
But then excitement followed. Little Himeko stepped closer... gripped the greatsword's hilt with both hands, glanced at Himeko... and prepared to lift it.
But... in that instant, she found the greatsword before her incredibly heavy. After obtaining the power of Stigmata, her strength had increased by an unknown number of times, yet it was still this heavy.
Without the power of Stigmata, she might not have been able to lift it at all. But now... exerting all her strength... she still managed to raise the greatsword.
"Very good. What matters most with a greatsword is its power. When you can wield it as lightly as if it were nothing, you'll have basically mastered the basics."
Unlike those artificial Stigmata—or rather, unlike the Stigmata of this world—equipping Stigmata instantly enhanced her strength and speed.
"But... isn't this greatsword too heavy?! If I fought with it... it doesn't feel very convenient!"